For act 5 2 take the middle path. You dont need to complete any of the levels to earn the achievement. Quitting immediately after finding the box is fine.

I found one of these boxes in the second last level, im not really sure what they do, does anyone happen to know!?

Good thing I took screenshots of all the cubes I found beforehand, I had no idea there was an achievement for it, only after I went check the achievements for this game.

Bird-fellas last stage. You'll find catslimes in lounge chairs and a few in the water. You need to take them all out, be don't fall into the water(death-pit)

Prob not the best place to ask but have y'all been able to find how to get the You Monster achievement? Last one I need and I'm stumped.

I can second what @basset basset said. You do not have to complete the levels, simply stand next to the boxes so the camera can clearly cover the entire box.

Damn didnt realize this was up. Just spent like an hour going through each level taking pictures finding them to make a guide. Nice work!

Dammit! I didn't notice this guide was already here. I've just been taking screenshots myself to create a guide.

I just got it! you don't have to complete a stage to register it, just make sure you get close enough to see it such as standing right next to it. Makes it a lot easier than having to complete some of the longer levels XD

No clue. I did so just in case.